include/linux/netfilter/nf_conntrack_common.h

   1 #ifndef _NF_CONNTRACK_COMMON_H
   2 #define _NF_CONNTRACK_COMMON_H
   3 /* Connection state tracking for netfilter.  This is separated from,
   4    but required by, the NAT layer; it can also be used by an iptables
   5    extension. */
   6 enum ip_conntrack_info {
   7         /* Part of an established connection (either direction). */
   8         IP_CT_ESTABLISHED,
   9
  10         /* Like NEW, but related to an existing connection, or ICMP error
  11            (in either direction). */
  12         IP_CT_RELATED,
  13
  14         /* Started a new connection to track (only
  15            IP_CT_DIR_ORIGINAL); may be a retransmission. */
  16         IP_CT_NEW,
  17
  18         /* >= this indicates reply direction */
  19         IP_CT_IS_REPLY,
  20
  21         /* Number of distinct IP_CT types (no NEW in reply dirn). */
  22         IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
  23 };
  24
  25 /* Bitset representing status of connection. */
  26 enum ip_conntrack_status {
  27         /* It's an expected connection: bit 0 set.  This bit never changed */
  28         IPS_EXPECTED_BIT = 0,
  29         IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
  30
  31         /* We've seen packets both ways: bit 1 set.  Can be set, not unset. */
  32         IPS_SEEN_REPLY_BIT = 1,
  33         IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
  34
  35         /* Conntrack should never be early-expired. */
  36         IPS_ASSURED_BIT = 2,
  37         IPS_ASSURED = (1 << IPS_ASSURED_BIT),
  38
  39         /* Connection is confirmed: originating packet has left box */
  40         IPS_CONFIRMED_BIT = 3,
  41         IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
  42
  43         /* Connection needs src nat in orig dir.  This bit never changed. */
  44         IPS_SRC_NAT_BIT = 4,
  45         IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
  46
  47         /* Connection needs dst nat in orig dir.  This bit never changed. */
  48         IPS_DST_NAT_BIT = 5,
  49         IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
  50
  51         /* Both together. */
  52         IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
  53
  54         /* Connection needs TCP sequence adjusted. */
  55         IPS_SEQ_ADJUST_BIT = 6,
  56         IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
  57
  58         /* NAT initialization bits. */
  59         IPS_SRC_NAT_DONE_BIT = 7,
  60         IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
  61
  62         IPS_DST_NAT_DONE_BIT = 8,
  63         IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
  64
  65         /* Both together */
  66         IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
  67
  68         /* Connection is dying (removed from lists), can not be unset. */
  69         IPS_DYING_BIT = 9,
  70         IPS_DYING = (1 << IPS_DYING_BIT),
  71
  72         /* Connection has fixed timeout. */
  73         IPS_FIXED_TIMEOUT_BIT = 10,
  74         IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
  75 };
  76
  77 #ifdef __KERNEL__
  78 struct ip_conntrack_stat {
  79         unsigned int searched;
  80         unsigned int found;
  81         unsigned int new;
  82         unsigned int invalid;
  83         unsigned int ignore;
  84         unsigned int delete;
  85         unsigned int delete_list;
  86         unsigned int insert;
  87         unsigned int insert_failed;
  88         unsigned int drop;
  89         unsigned int early_drop;
  90         unsigned int error;
  91         unsigned int expect_new;
  92         unsigned int expect_create;
  93         unsigned int expect_delete;
  94 };
  95
  96 /* call to create an explicit dependency on nf_conntrack. */
  97 extern void need_conntrack(void);
  98
  99 #endif /* __KERNEL__ */
 100
 101 #endif /* _NF_CONNTRACK_COMMON_H */